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Three Fuel ?

Is it possible to have a heat pump with a heat strip plus furnace??

Here is what I'm thinking; If I could have a heat pump w/heat strip, so in defrost mode the strips would come on down to a temp of 32*, where the heat pump and strip is locked out so the furnace would take over.

Is this possible ??

It seems almost a waste to have a furnace kick on for just a few minutes during defrost. How much heat does a furnace even create during defrost?
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I going to try to not use any heat during defrost as I plan the chnage-over for a fairly mild ambient. But if that is uncomfortable - I have ten KW of electric heat ready to go.

Dude different folks different strokes.Besides down here you don't have that cold of a winter.For some reason that is what the customer wanted so that is what he got.I really didn't see the point but I get paid by the hr.

Part of the problem is the on-delay time

With a 90+ furnace cycling on - it's probably the better part of five minutes before it is producing any noticable amount of heat. And by then the defrost is likely over anyway.

The electric heat elements are almost instant-on.

For 'mild ambient change-over' I have in mind maybe thirty or thirty-five degrees. But like so many things in my Life there will, no doubt; be some tweaking involved.

Of course; I do live ever in the hope that beenthere will come to my design-rescue, tell me what to do for the best, and so spare me the tedious agony of overcoming my own fumbling attempts at empirical sorting. <g>

PHM
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The conventional view serves to protect us from the painful job of thinking.